Classifications

• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C45/00—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds
  • C07C45/49—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by reaction with carbon monoxide
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C41/00—Preparation of ethers; Preparation of compounds having groups, groups or groups
  • C07C41/48—Preparation of compounds having groups
  • C07C41/50—Preparation of compounds having groups by reactions producing groups
  • C07C41/56—Preparation of compounds having groups by reactions producing groups by condensation of aldehydes, paraformaldehyde, or ketones
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C45/00—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds
  • C07C45/51—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by pyrolysis, rearrangement or decomposition
  • C07C45/511—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by pyrolysis, rearrangement or decomposition involving transformation of singly bound oxygen functional groups to >C = O groups
  • C07C45/515—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by pyrolysis, rearrangement or decomposition involving transformation of singly bound oxygen functional groups to >C = O groups the singly bound functional group being an acetalised, ketalised hemi-acetalised, or hemi-ketalised hydroxyl group

Definitions

• the invention pertains to the method for the preparation of 1,4-butandial (succindialdehyde) from acrolein by the conversion of the acrolein in an acetal, hydroformylation of the acetal and hydrolysis of the hydroformylation product.
• 1,4-butandial from acrolein.
• the acrolein is first formed into allylidendiacylate, the latter is then hydroformylated to 4,4-diacyloxybutyraldehyde, which in turn is thereafter through conversion with an alkanol formed into 2,5-dialkoxytetrahydrofuran and finally this is hydrolyzed into 1,4-butandial (U.S. Pat. No. 2,920,081).
• This process too, provides only mediocre yields and is in addition complicated and accordingly not desirable for utilization on a commercial scale.
• 1,4-butandial can be prepared by a method utilizing acrolein by conversion of the acrolein into an acetal, hydroformylating the acetal and hydrolyzying the hydroformylation product, wherein the process is carried out by the steps comprising:
• This method provides considerably improved yields of 1,4-butandial compared to the known methods.
• the step of hydroformylation is determinative. This is because heretofore, the hydroformylation of acyclic acetals was not useable in a practicable manner and as a result thereof the preparation of 1,4-butandial in this respect was not a feasible reality, so for that reason the inventive hydroformylation of these acetals is carried out with such outstanding results that the formation of 1,4-butandial by these ways is particularly advantageous.
• the acrolein is converted with an alkanol into a 3,3-dialkoxy-1-propene.
• a 3,3-dialkoxy-1-propene is chosen so that in each alkoxy group, there is 1 to 6 carbon atoms.
• the 3,3-dimethoxy-1-propene and the 3,3-diethyl-1-propene are preferred.
• the conversion is carried out by known methods, such as for example, as shown in the Org. Synth. Coll., Vol. 4, (1963), pp. 21-22 (relied on and incorporated herein by reference) which describes the method for preparation using the selected alkanols with the acrolein in the presence of strong acid as catalysts.
• the method described in the concurrently filed patent application German P No. 34 03 426.9 (corresponding to U.S. application Ser. No. 694,371) can be used.
• the acrolein is converted with alkanol in the presence of a solid acidic catalyst, such as strongly acidic ion exchanger or strongly acidic zeolites, and the 3,3-dialkoxy-1-propene is obtained and, after the removal of the catalyst material, the reaction mixture is extracted with water insoluble organic solvents and the extract is fractionally distilled.
• a solid acidic catalyst such as strongly acidic ion exchanger or strongly acidic zeolites
• the 3,3-dialkoxy-1-propene is hydroformylated by means of conversion with a gas mixture of hydrogen and carbon monoxide in the presence of a catalyst.
• This conversion is carried out in an efficient manner at elevated temperatures, especially at a temperature between about 100° and 140° C.
• the pressure can be widely varied as desired; however, it is in general desirable to carry out the process at least at normal pressure. Preferably, the pressure is between about 1 and 6 bar. It is desirable to use at least stoichiometric quantities, preferably excess amounts, of hydrogen and carbon monoxide whereby the molecular ratio of the hydrogen to carbon monoxide can be widely varied as desired, preferably however, between 0.5 to 1 to 1 to 0.5.
• the catalyst which serves for this purpose is hydridotris-triphenylphosphinerhodiumcarbonyl in a mixture with triphenylphosphine, or preferably triphenylphosphite.
• these catalysts are described in DE-AS No. 1,793,069 and are known in the art.
• the weight ratio based on one part by weight of 3,3-dialkoxy-1-propene ranges from about 0.0001 to 0.0025 parts by weight of hydridotristriphenylphosphine-rhodiumcarbonyls and 0.04 to 0.06 parts by weight of the triphenylphosphine or triphenylphosphite.
• the hydroformylation product is fractionally distilled in order to obtain the 4,4-dialkoxybutanal.
• a reduced pressure preferably with the pressure below 50 mbar.
• the 4,4-dialkoxybutanal obtained thereby is subsequently converted into the 1,4-butandial through hydrolysis.
• the hydrolysis is carried out in an acidic medium, preferably in a strongly acidic medium, with a particular advantage in carrying out the process in the presence of an acidic ion exchanger, advantageously at a temperature below 30° C., preferably at a temperature between 5° and 15° C.
• an acidic ion exchanger advantageously at a temperature below 30° C., preferably at a temperature between 5° and 15° C.
• suitable acidic ion exchangers e.g. resins, may be used for purposes of the invention.
• the 3,3-diethoxy-1-propene in a stirred autoclave, is contacted with 9.4 g triphenylphosphite and 0.4 g hydridotrie-triphenylphosphinerhodiumcarbonyl. This was formed into a mixture under 3 bar pressure charged with an equal volume of hydrogen and carbon monoxide. The temperature in the autoclave was held at 110° C. After 140 minutes, no further gas was taken up and the charging was ended. By means of gas chromatography, it was determined that 99.5% of the 3,3-diethoxy-1-propene was converted. The conversion mixture included 4,4-diethoxy-butanal and 2-methyl-3,3-diethoxy-propanal in a mol ratio of 8.5 to 1.
• the conversion mixture is then distilled at 20 mbar.
• the desired 4,4-diethoxybutanal was obtained at 90° to 91° C. It was dissolved in an equal volume of water and the solution was converted with 60 g ion exchange resin Dowex MSC-1. The mixture was stirred for 2 hours at 20° and then filtered. The filtrate was a 25% aqueous solution of the 1,4-butandial. The yield of the 1,4-butandial, based on the introduced 3,3-diethoxy-1-propene, amounted to 80%.
• the recovered acrolein and methanol were continuously recycled to the loop reactor.
• the 3,3-dimethoxy-1-propene was 98%.
• the boiling point was 89° to 90° C.
• the process was carried out according to Example 1, however 204.3 g (2.0 mol) of the obtained 3,3-dimethoxy-1-propene was introduced into the stirred autoclave. 99.5% of the 3,3-dimthoxy-1-propene was converted.
• the conversion mixture contained 4,4-dimethoxy-butanal and 2-methyl-3,3-dimethoxypropanal in a mol ratio of 10.3 to 1.
• the conversion mixture was distilled at 18 mbar.

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• Chemical & Material Sciences (AREA)
• Organic Chemistry (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
• Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)
• Catalysts (AREA)
• Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
• Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)

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• 1984
  • 1984-02-01 DE DE19843403427 patent/DE3403427A1/de not_active Withdrawn
  • 1984-11-15 AT AT84113804T patent/ATE30146T1/de not_active IP Right Cessation
  • 1984-11-15 DE DE8484113804T patent/DE3466678D1/de not_active Expired
  • 1984-11-15 EP EP84113804A patent/EP0151241B1/fr not_active Expired
  • 1984-12-17 ES ES538662A patent/ES8601832A1/es not_active Expired
• 1985
  • 1985-01-24 US US06/694,372 patent/US4608443A/en not_active Expired - Fee Related
  • 1985-01-30 BR BR8500420A patent/BR8500420A/pt unknown
  • 1985-01-30 DD DD85272874A patent/DD232486A5/de unknown
  • 1985-01-31 JP JP60015664A patent/JPH0629205B2/ja not_active Expired - Lifetime
  • 1985-01-31 CA CA000473284A patent/CA1265533A/fr not_active Expired - Lifetime

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